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BITSAT 2019 Physics Heat and Thermodynamics Revision Quiz 2

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Question 1

One mole of an ideal gas at an initial temperature

, undergoes a quasi-static process during which the volume

is doubled. During the process the internal energy

obeys the equation

, where

is a constant. The work done during this process is

Question 2

A thin piece of thermal conductor of constant thermal conductivity insulated on the lateral sides connects two reservoirs which are maintained at temperatures

and

as shown.
Assuming that the system is in steady state, which of the following plots best represents the dependence of the rate of change of entropy on the ratio of temperatures

Question 3

The resistance of an electrical toaster has a temperature dependence given by

in its range of operation. At

and at

. The toaster is connected to a voltage source at 200 V and its temperature is raised at a constant rate from 300 to 500 K in 30 s. The total work done in rising the temperature is:

Question 4

Which of the following statements is incorrect?

Question 5

Power emitted by a black body at temperature 50°C is P. Now temperature is doubled i.e. temperature of black body becomes 100 °C. Now power emitted is:

Question 6

A 10.0 W electrical heater is used to heat a container filled with 0.5 kg of water. It is found that the temperature of the water and the container rose by 3 K in 15 minutes. The container is then emptied, dried, and filled with 2 kg of an oil. It is now observed that the same heater raises the temperature of the container-oil system by 2 K in 20 minutes. Assuming no other heat losses in any of the processes, the specific heat capacity of the oil is

Question 7

A sphere, a cube and a thin circular plate have the same mass and are made of the same material. All of them are heated to the same temperature. The rate of cooling is

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Apr 29JEE & BITSAT